PEUGEOT ION Handbook page 166

RADIO CODE
After battery disconnection, a code must be
entered for operation of the radio.
A maximum of 5 attempt are possible. For the
last two attempts, a wait of around 15 minutes
is imposed.
Keep your code in a safe place, never inside
the vehicle.
When undertaking a long trip or journey,
however, it is advisable to take the code with
you along with your personal papers.